Means and method for pressing talking machine records



June 27, 1933. E. B. FERNBERG 1,915,357

MEANS AND METHOD FOR PRESSING TALKING MACHINE RECORDS Filed April 2, 1950 .6 H 1. 5 7 IO '8 INVENTOR.

17/8 A TTORNEY.

Patented June "27, 1933 PATENT FENCE ERIC BIRGER FERNIBERG, F EDG-WARE, ENGLAND, ASSIGNOR T0 VICTOR TALKING MACHINE COMPANY, A. C1OR]?()RAIION OF NEW JERSEY MEANS ANDMETHOID' FOR PRESSING TALKING MACHINE RECORDS Application filed April 2, 1930, SerialNo. 441,130, and inGreat Britain' April is, 1929.

This invention relates to improvements in and relating to means'for pressing talking machine records and in particular to means for detaching a pressed record from the '5 mould in which it is pressed.

The usual practice in pressing disc records is to clamp the upper and lower matrices in the upper and lower heating and cooling moulds by means of retaining rings which are bolted to the moulds and have an inwardly extending flangewhich overlaps the edge of the matrix and holds it firmly clamped to its mould. The inner edges of the flanges of the retaining rings are bevelled slightly out- 18' wards.

After the record ispressed the lower matrix for example is withdrawn and it often happens that the pressed record .is found to adhere closely to either mould and readily detached.

The object of the present invention'is to provide means which ensure that when the moulds are withdrawn from one another the pressed record shall be quite free for immeis not very v diate removal.

According to the present invention there are formed, preferably at two points on opposite sides of'a record, slots or recesses into which a portion of the edge of the record material is pressed. The recess or recesses on one side are formed in a body which moves rigidlywith the lower mould, and'the recess or recesses on the opposite side are formed in a body which is rigid with the upper mould,

with the consequence that the pressed record is held atone side in contact, for example with the lower mould, while on the opposite side it is lifted away from the lower mould.

The invention is illustratedin the accompanying drawing in which Fig. 1 is a sectional view of those parts of the upper and lower moulds of arecord press to which the matrices are fixed. i

Fig. 2 is a view illustrating'a part of one 15 of the matrix retaining rings constructed according to the invention. i Y

Figs. 3 and e illustrate an alternative construction and Fig. 5 illustrates a third construction according to the invention.

outwards.

Referring to Figs. 1 and 2 of the drawing,

1 and 2 are the upper and lower mould plates respectively of a record press and 3 and 4 are the matrices secured to the moulds l and 2 in the usual manner by retaining rings5 which are bolted in recesses 6 in the moulds, and have inwardly projecting flanges 7 which overlap the edge of the matrix. The inner edges of the flanges 7 are bevelled slightly In the edges 7 are formed slots or recesses 8. the slots or recesses 8 in the lower retaining ring 5 being arranged, in the case illustrated, at. the right hand side and those in the upper retaining ring arrangedat the left hand side. When a record 9 is being pressed, portions 10 of material at the edge of the record enter the recesses 8. When the mouldsl and 2 are moved apart after pressing, the record remains for a time with the left hand edge in engagement with the upper mould 1 and the right hand edge in engagement with the lower; mould 2 and in consequence the record is detached from both matrices.

In an alternative construction Figs. 3 and 4, instead of the recess or recesses 8 being formed in the retaining ring 5 directly, the retaining ring may be slotted as at 11, and in-the'slot 11 an insertable plate piece 12 matching the peripheral contour of the ring 5, may be fixed, the inner periphery of the said piece 12 being provided with agroove or recess 8, the recess in this case lying approximately in the central plane of the pressed record, whereas in the case illustrated in Figs. 1 and 2 therecess lies either above or below the middle plane of-the record. here this inserted plate piece 12 is used the retaining ring of. the opposite mould is slotted suitably as at 13 to provide clearance for the-reception of the inner end of the inserted piece 12.

In yet another form illustrated in Fig. 5, the retaining ring 5 is slotted as at 11 and there is fixed in the slot an inserted plate piece 12 which, at its inner end 14, is recessed at 8 and extends above the level of the middle plane indicated by line 15 of the record 9, the retaining ring 5 of the upper mould being'correspondingly slotted for clearance is that the record 9, at say the right hand: side as illustrated, is held down against the lower mould 2, while at its opposite side it is lifted away from the lower mould 2. The hold onthe record 9 only lasts for a short portion of the movement of the moulds 1 and 2 apart and as the recesses'8 in the holding rings 5 are only made for a short portion of the circumference oi the record 9, there is no distorting action upon the pressed record which might tend to break it, the record being heldby the recesses 8 only for a sufiicient length of time to ensure that it is detachedfrom both matrices 3, 4.

The slots or recesses may be continuous or there may be several of them spaced at inter "als as shown in Fig. 2.

I claim:

lQA press for talking machine records wherein slots or recesses are provided at at least two points spaced around the record being pressed, into which recesses a portion of the edge of the record material ean'enter.

during the pressing operation, one or more of said recesses being formed in a body fixed to "one press mouldandone or more of, said recesses being formed in a body fixed to the other press mould, so that as the moulds are moved apart after pressing, one side of the pressedrecord remains in contact with one mould and the other side of the record is lifted away from'that mould. I

2. A press according to claim 1, wherein the slots or recesses are formed in the inner edge of the matrix retaining rings, the slotsv 0r recesses in one ring being on the opposite side of the record to the slots'or recesses in the other'ring. it

3. A press according to claim 1, wherein the slots. or recesses are formed in pieces inserted; in slots provided in the retaining rings.

4. A press according to claim 1, wherein the slots or recesses are formed in'pieces inserted in slots provided in the retaining rings, said insertedpieces projecting beyond the central plane of the record, theopposite retaining rings being recessed or slotted at suitable points to receive the projecting parts of the inserted pieces.

'5; In a record press including oppositely disposed matrices, retaining rings therefor,

each of said rings having a recess formed thereinat diametrically opposite points, said recesses being adapted to receive a portion of record'material therein while said mateposition with respect to said matrices by the opening of said press.

8. The step in the method of separating a record disc from the working faces of a plurality of matrices including matrix re taining rings for said matrices which consists in causing'the record disc material to anchor at a point on it-speripheral edge to one of said matrix retainingrings and at a diametrically opposite point on its peripheral edge to'the other of said matrix retain.- ing rings.-

v 4 9. The'step in the method of separating a record disc from the working faces. of a plurality of matrices including matrix retainof said rings at one point on its periphery, and causing said material to anchor to the other'of said rings at another point on its periphery spaced from said first-point.

,10. Ina record press including a pair of oppositely disposed matrices and a pair of retaining rings for said matrices, means on each of said rings at diametrically opposite ing rings for said, matrices which consists in causing the record material to anchor to one points for receiving a portion of record disc H inaterial to anchor said material thereto oppositely disposed matrices and a pair of retainingrings for said matrices, means on one of sald-rlngs for anchoring record material at one polnt thereon, and means on the other of said rings for anchoring said rec- 0rd material at a diametrically opposite point thereon,whereby said material is antomatically substantially separated from said matricesupon the opening of said press.

12. In a record press includin a pair of oppositely disposed matrices and a pair of retainingrings for said matrices, spaced means on the inner periphery of said rings for receivlng a-portion of record material to anchor said material thereto whereby said 'material is substantially separated from said matrices upon the opening ofsaid press.

13. In a record press including-oppositely disposed matrices and retaining rings there- 'for, meanscarried by each of said rings adapted to permit entry of record material while said material is under compression between said matrices, and means formed on each of said rings to register with and effect clearance for said first named means upon the closing of said press.

7 14. In a record press including oppositely disposed matrices and retaining rings therefor, means carried by said rings for causing record material to positively attach itself at diametrically opposite points on its periphery to said rings during compression and to subsequently be raised into an inclined position with respect to the working surfaces of said matrices upon the opening of said press.

15. In a record press including a pair of oppositely disposedmatrices and a pair of retaining rings for said matrices, means on one of said rings for anchoring record material at one point thereon and means on the other of said rings for anchoring said record material at a point peripherally spaced from said first point thereon whereby said material is automatically separated from said matrices upon the opening of said press.

16. The method of molding a phonograph record or the like from plastic material through the utilization of a plurality of mold-elements which comprises depositing a portion of the material, in a plastic condition, between the said elements, bringing the elements toward one another to exert pressure upon the material, causing a marginal portion of the pressed material extraneous of the main contour thereof to be temporarily anchored to one mold-element, and causing a substantially diametrically similar marginal portion to be temporarily anchored to the other mold-element whereby, when the molds are moved apart, the said marginal anchorages cause the pressed material to be stripped from the mold-elements.

In testimony whereof I have signed my name to this specification.

ERIC BIB-GER FERNBERG. 

